Does anyone have any views about the best file synchronization software (preferably free, but if you have to pay to get accurate and reliable results, I'd like to hear about that too.)

I want to select particular files and folders to backup to an external hard drive. I don't need it to happen automatically or in the background. My computer is not the fastest or the latest, so all I want to do is set up a backup profile and then run the software manually when I choose to do a backup.

I have done a google search, but can't find any reviews by sites or people I trust - they all seem to be advertising rather than genuine reviews.

I have read about MS Synctoy and also Syncexpert, but I'd like to hear from people with personal experience of this sort of software.

I run Windows XP Pro SP3, Pentium 4(3gig), 2 Gig Ram.